Gate bitdrift integration (#7088)

* Move Statsig init call earlier

* Gate Bitdrift init call

* Remove IS_TEST env constant

* Mock statsig

src/lib/bitdrift.ts

@@ -1,7 +1,20 @@
 import {init} from '@bitdrift/react-native'
+import {Statsig} from 'statsig-react-native-expo'
+
+import {initPromise} from './statsig/statsig'
 
 const BITDRIFT_API_KEY = process.env.BITDRIFT_API_KEY
 
-if (BITDRIFT_API_KEY) {
-  init(BITDRIFT_API_KEY, {url: 'https://api-bsky.bitdrift.io'})
-}
+initPromise.then(() => {
+  let isEnabled = false
+  try {
+    if (Statsig.checkGate('enable_bitdrift')) {
+      isEnabled = true
+    }
+  } catch (e) {
+    // Statsig may complain about it being called too early.
+  }
+  if (isEnabled && BITDRIFT_API_KEY) {
+    init(BITDRIFT_API_KEY, {url: 'https://api-bsky.bitdrift.io'})
+  }
+})